Earring back clasp



FIG. 1 is a perspective view of an earring back clasp illustrating our new design.

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of this view.

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image of this view.

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines illustrate portions of the earring back clasp which form no part of the claimed design. 

The ornamental design for an earring back clasp, as shown and described. 